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n in (-oo:+oo)
-8*n-(-2/7) = 6 // - 6
-8*n-(-2/7)-6 = 0
2/7-8*n-6 = 0
-8*n-40/7 = 0 // + 40/7
-8*n = 40/7 // : -8
n = 40/7/(-8)
n = -5/7
n = -5/7
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